LSI ITI8000 Series, User Manual

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ITI8000 Series CompactPCI Multifunction Adapters 3-1
Rev. 1.0 Copyright © 2000–2001 by LSI Logic Corporation. All rights reserved.
Chapter 3
Configuring SCSI
Devices
This chapter provides information about configuring SCSI devices with
specific reference to the ITI8200 Series CompactPCI adapters. It
includes these topics:
•
Section 3.1, “General Description,” page 3-1
•
Section 3.2, “Terminating the SCSI Bus,” page 3-5
•
Section 3.3, “Setting SCSI IDs,” page 3-7
•
Section 3.4, “Connecting Internal and External Devices,” page 3-8
•
Section 3.5, “Cabling SCSI Devices,” page 3-10
3.1 General Description
Correct installation of your adapter requires that you first understand the
basic rules of the SCSI bus and correctly configure the termination. The
configuration is based on the position of the LSI Logic CompactPCI
adapter on the bus. In order for a SCSI bus to operate, it must be
electrically terminated at both ends.
Each of the two Ultra2 SCSI ports are capable of running LVD at up to
80 Mbytes/s or Single-Ended (SE) at up to 40 Mbytes/s. If you place an
SE device on an LVD bus, the bus will run in SE mode. As a result, this
configuration reduces the overall bandwidth of the bus to 40 Mbytes/s.
The terminators for Low Voltage Differential (LVD) and Single-Ended
(SE) on the ITI8200 Series CompactPCI adapters are fully automatic.
Under normal circumstances, no manual intervention for correct
operation is necessary.